Sometimes I make an effort to be productive during Cole's nap time. Other times, not so much. I just like to sit down. Sometimes with a book or a couple of articles. Other times I'm less inclined to read for fear I'll fall asleep. During those times, I like to listen to Mockingbird's conference recordings: 2013, 2012, 2010 (there are videos too but I stick to the recordings since I can find them all on one page)*. Take a gander if you think you'd be into that sort of thing.
*For the record, there are also some shows I watch if I'd rather do something mindless.